Have you used these lenses? Nikon, tamron, or sigma 70-200mm f2.8?
Added (1). I need a good 70-200mm f2.8 dx lens for a nikon body, I have hands on experience with the sigma version, but haven't used the tamron or nikon variants. I was wondering if you could offer any perks of either or compare them if you have used any or all of them.
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